I had some portable speakers from Creative, The Travelsound 200 or 2000 i don't remember them well, the were rectangular and foldable

They had a switch that widened the soundstage, as i recall they sounded impressive with the widened soundstage, like they were placed feet away from me. But they were only a few inches from me.

They have extra-speakers hidden?

dfkt

06-06-2012 09:56 AM

Usually it's some psychoacoustic trick that messes with the phase of the stereo signal, or adds complementary/canceling/delayed signals to the opposite channels, similar to an inverse crossfeed.

WalkGood

06-06-2012 10:03 AM

I've never had a unit that offers that, good point on "inverse crossfeed" description dfkt, that makes total sense to me.

Edit: I mean good analogy.

saratoga

06-15-2012 09:47 AM

Quote:

Originally Posted by JSBach
(Post 613218)

They had a switch that widened the soundstage, as i recall they sounded impressive with the widened soundstage, like they were placed feet away from me. But they were only a few inches from me.

I guess its very similar to how a headphone crossfeed works. Some fraction of the bass frequencies is time delayed and then added to the other channel to make it feel like they're originating from further away.

xnor

06-15-2012 02:02 PM

There are a couple of ways to do this but a common one is to take the L channel, attenuate it, invert the phase and add it to the R channel and vice-versa.

Crossfeeds are usually a bit more sophisticated by adding phase shift / delay instead of inverting the phase (to reduce stereo separation) and treating lows/mids (lower attenuation) differently from treble (higher attenuation, see head shadow).